kratos2333
2/20/2019 - 9:36 PM

Flask Flash message

Flash-Messages.py
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from flask import Flask, render_template, flash, session, redirect, url_for
from flask_wtf import FlaskForm
from wtforms import StringField,SubmitField

app = Flask(__name__)
# Configure a secret SECRET_KEY
# We will later learn much better ways to do this!!
app.config['SECRET_KEY'] = 'mysecretkey'

# Now create a WTForm Class
# Lots of fields available:
# http://wtforms.readthedocs.io/en/stable/fields.html
class SimpleForm(FlaskForm):
    # Just One Button
    submit = SubmitField('Click Me.')

@app.route('/', methods=['GET', 'POST'])
def index():
    form = SimpleForm()

    if form.validate_on_submit():
        flash("You just clicked the button!")

        return redirect(url_for('index'))
    return render_template('02-home.html', form=form)


if __name__ == '__main__':
    app.run(debug=True)
home.html
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<head>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
  <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

</head>


{# Source for this bootstrapcode:
https://getbootstrap.com/docs/4.0/components/alerts/#dismissing #}
<div class="container">


  {# get_flashed_messages() is auto sent to the template with the flash() call #}
      {% for mess in get_flashed_messages()  %}
      <div class="alert alert-warning alert-dismissible fade show" role="alert">
        <button type="button" class="close" data-dismiss="alert" aria-label="Close" class="fade close">
          <span aria-hidden="true">&times;</span>
        </button>
        {{mess}}
        </div>
      {% endfor %}


<form method="POST">
    {# This hidden_tag is a CSRF security feature. #}
    {{ form.hidden_tag() }}
    {{ form.submit() }}
</form>
</div>